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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/net/ipv6/addrconf_core.c
15109 views
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/*

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 * IPv6 library code, needed by static components when full IPv6 support is

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 * not configured or static.

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 */

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#include <net/ipv6.h>

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#define IPV6_ADDR_SCOPE_TYPE(scope)	((scope) << 16)

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static inline unsigned ipv6_addr_scope2type(unsigned scope)

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{

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	switch(scope) {

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	case IPV6_ADDR_SCOPE_NODELOCAL:

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		return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |

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			IPV6_ADDR_LOOPBACK);

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	case IPV6_ADDR_SCOPE_LINKLOCAL:

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		return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |

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			IPV6_ADDR_LINKLOCAL);

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	case IPV6_ADDR_SCOPE_SITELOCAL:

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		return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |

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			IPV6_ADDR_SITELOCAL);

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	}

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	return IPV6_ADDR_SCOPE_TYPE(scope);

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}

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int __ipv6_addr_type(const struct in6_addr *addr)

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{

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	__be32 st;

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	st = addr->s6_addr32[0];

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	/* Consider all addresses with the first three bits different of

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	   000 and 111 as unicasts.

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	 */

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	if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&

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	    (st & htonl(0xE0000000)) != htonl(0xE0000000))

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		return (IPV6_ADDR_UNICAST |

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			IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));

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	if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {

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		/* multicast */

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		/* addr-select 3.1 */

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		return (IPV6_ADDR_MULTICAST |

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			ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));

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	}

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	if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))

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		return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |

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			IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));		/* addr-select 3.1 */

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	if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))

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		return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |

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			IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL));		/* addr-select 3.1 */

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	if ((st & htonl(0xFE000000)) == htonl(0xFC000000))

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		return (IPV6_ADDR_UNICAST |

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			IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));			/* RFC 4193 */

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	if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {

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		if (addr->s6_addr32[2] == 0) {

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			if (addr->s6_addr32[3] == 0)

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				return IPV6_ADDR_ANY;

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			if (addr->s6_addr32[3] == htonl(0x00000001))

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				return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |

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					IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));	/* addr-select 3.4 */

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			return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |

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				IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));	/* addr-select 3.3 */

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		}

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		if (addr->s6_addr32[2] == htonl(0x0000ffff))

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			return (IPV6_ADDR_MAPPED |

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				IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));	/* addr-select 3.3 */

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	}

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	return (IPV6_ADDR_UNICAST |

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		IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));	/* addr-select 3.4 */

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}

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EXPORT_SYMBOL(__ipv6_addr_type);

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